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→Semi-Permeable Membrane
==Semi-Permeable Membrane==
===GO2Altitude===
GO2Altitude focuses on systems for [[Intermittent Hypoxic Training]] rather than sleep systems and appear to use a semi-permeable membrane technique. The cheapest system is their One Person / Portable.Their focus seems to have changed to aviation usage and their web site is now http://www.hypoxic-training.com/* One Person / Portable 2010, $5,990 ($6,500 delivered). Provides 21,000 ft and comes with [[Pulse Oximeter]], PC software and hoses/masks
==See Also==
* [[The Science of Altitude Training]]